<template>
	<view>
		<my-search @click="gotoSearch"></my-search>
		
		<view class="scroll-view-container">
			<!-- 左侧滑区 -->
			<scroll-view class="left-scroll-view" scroll-y="true" :style="{height:wh+'px'}">
				<block v-for="(item,i) in cateList" :key="i">
					<view  class="left-scroll-view-item" :class="active==i?'active':''" @click="clickList(i)">{{item.cat_name}}</view>
				</block>
				
			</scroll-view>
			<!-- 右侧滑区 -->
			<scroll-view class="right-scroll-view" scroll-y="true" :style="{height:wh+'px'}" :scroll-top="scrollTop">
				<!-- 二级分类 -->
				<view class="cate-lv2" v-for="(item2,i2) in cateLevel2" :key="i2">
					<view class="cate-lv2-title">/{{item2.cat_name}}/</view>
					<!-- 三级分类 -->
					<view class="cate-lv3-list">
						<view class="cate-lv3-item" v-for="(item3,i3) in item2.children" :key="i3" @click="gotoGoodsList(item3)">
							<image :src="item3.cat_icon"></image>
							<text>{{item3.cat_name}}</text>
						</view>
					</view>
				</view>
			</scroll-view>
		</view>
		
	</view>
</template>

<script>
	export default {
		data() {
			return {
				//当前设备可用高度
				wh: 0,
				active:0,
				cateList:[],
				// 二级分类列表
				cateLevel2: [],
				scrollTop:0
			}
		},
		onLoad() {
			const sysInfo = uni.getSystemInfoSync()
			this.wh = sysInfo.windowHeight - 50
			this.getCateList()
		},
		methods: {
			// 获取分类列表的数据
			async getCateList(){
				const {data:res} = await uni.$http.get('/api/public/v1/categories')
				if(res.meta.status !== 200){ return uni.$showMsg()}
				this.cateList = res.message
				console.log(res);
				// 为二级分类赋值
				this.cateLevel2 = res.message[0].children
			},
			// 选择分类
			clickList(i){
				this.active = i
				this.cateLevel2 = this.cateList[i].children
				this.scrollTop=this.scrollTop===0?1:0
			},
			// 跳转到商品列表页面
			gotoGoodsList(item){
				uni.navigateTo({
					url: '/subpkg/goods_list/goods_list?cid='+item.cat_id
				})
			},
			gotoSearch(){
				uni.navigateTo({
					url: '/subpkg/search/search'
				})
			}
		}
	}
</script>

<style lang="scss">
.scroll-view-container{
	display: flex;
	
	.left-scroll-view {
		width: 120px;
		.left-scroll-view-item{
			background-color: #f7f7f7;
			text-align: center;
			font-size: 12px;
			line-height: 60px;
			&.active {
				background-color: #fff;
				position: relative;
				&::before{
					content: '';
					position: absolute;
					top: 50%;
					transform: translateY(-50%);
					left: 0;
					display: block;
					width: 3px;
					height: 30px;
					background-color: #C00000;
				}
				
			}
		}
	}
}
.cate-lv2-title{
	font-size: 14px;
	font-weight: bold;
	text-align: center;
	padding: 15px 0;
}
.cate-lv3-list {
	display: flex;
	flex-wrap: wrap;
	.cate-lv3-item {
		width: 33.33%;
		display: flex;
		flex-direction: column;
		justify-content: center;
		align-items: center;
		image{
			width: 60px;
			height: 60px;
			margin-bottom: 10px;
		}
		text{
			font-size: 12px;
		}
	}
}
</style>
